Thanks alosso, I found it. Given such an important tournament I would have thought it was the least been on the WGT news page where you can see it when you 1st log onto the site.
But more importantly, they have the hour that you are talking about anyway, and I quote the rules for the championship, the phrase talking about the 2nd round:
"between 1:00 am PT July 5th, 2015 and 11:59 pm PT July
8th, 2015 (“Round 2”), and playing and completing the 18-hole stroke play game
between 1:00 am PT July 5th, 2015 and 11:59 pm PT July 8th, 2015."
Note the round finishes at 11:59 PT and the next round, starts at 1 AM PT.
What is interesting and I will take this up with WGT, the round actually finished at 11.59 PM PDT, that is Pacific daylight Time and not 11:50 9 PM PT.
There certainly is an hour at least between the end of around a new round, so as you say they could have had the downtime then.
My guess is that as most people had played, they did not worry about chopping a few, particularly as we were not the main contenders and they took no cognizance of the fact that, being an international site and people playing from all over the world, it was actually 3 PM Australian Eastern time, when they shut the site down